docs: name bot-bottle, not ./cli.py, in every instruction

`doctor` told users to run `./cli.py backend setup`. cli.py is a four-line
wrapper at the repo root that calls bot_bottle.cli:main, and it does not ship —
[tool.setuptools.packages.find] includes only bot_bottle*, so anyone who
installed rather than cloned has no such file. Confirmed against a real
install: the user's tree contains exactly one executable, `bot-bottle`, and no
cli.py anywhere, while doctor recommended `./cli.py` three times. Invisible in
development, where ./cli.py works fine from a checkout, which is why only a
clean-install test surfaced it.

The two entry points are the same code, so the fix is to name the one that
always exists. 141 replacements across 45 files: the runtime messages that
caused this, plus README, docs, PRDs, research notes and test prose, so nothing
teaches the invocation a user cannot run.

scripts/demo.sh is deliberately untouched — it *executes* ./cli.py from a
checkout, where that is the correct and available path.

Verified end to end: a sandbox install now reports
"Run: bot-bottle backend setup --backend=firecracker", and bot-bottle is on
that user's PATH. Unit suite unchanged against the pre-existing baseline.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WEfZZhakx13bxTfXcZCoS5

bot_bottle/backend/base.py

@@ -531,7 +531,7 @@ class BottleBackend(ABC, Generic[PlanT, CleanupT]):
         host-appropriate config or commands. Prints to stdout/stderr and
         returns a shell exit code (0 = nothing to report / success). A
         backend that needs no host setup prints a short note and returns
-        0. Invoked generically by `./cli.py backend setup [--backend=…]`
+        0. Invoked generically by `bot-bottle backend setup [--backend=…]`
         so operators can provision any backend without a
         backend-specific command. Classmethod (like `is_available`) —
         it's a host query, not per-bottle state."""
@@ -548,14 +548,14 @@ class BottleBackend(ABC, Generic[PlanT, CleanupT]):
         stderr. When quiet=True returns the status code silently —
         useful for cheap programmatic checks.
 
-        Invoked by `./cli.py backend status [--backend=…]` (quiet=False)
+        Invoked by `bot-bottle backend status [--backend=…]` (quiet=False)
         and by is_backend_ready() (caller-controlled)."""
 
     @classmethod
     @abstractmethod
     def teardown(cls) -> int:
         """Undo `setup()` — the inverse operation, surfaced as
-        `./cli.py backend teardown [--backend=…]` (uninstall). Symmetric
+        `bot-bottle backend teardown [--backend=…]` (uninstall). Symmetric
         with setup: where setup is advisory (prints the privileged
         commands / declarative config to apply), teardown prints the
         commands / config change to remove the host prerequisites. A